Spotting

Description:

Roughly 2 - 3 mm in length. These caterpillar-like bugs were spotted clinging onto a rock face where water was constantly flowing over them. They seem to secure themselves with one end to the rock, while the loose end flutters in the current. When they move though, they swing the loose end up (say they were going up) and they latch that end onto the rock, and then swing the other, now free end up and latch that, and repeat the process. Seems like they could be a larva of some sort, but I really have no idea.

Habitat:

Spotted this critter while on a hike through some dry and hot southern California terrain. The bugs themselves were in what little water was there though, among the rocks where the waterfalls trickle.